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 Post subject: new 498
 Post Posted: Sat Nov 21, 2009 11:22 am 
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Joined: Mon Jan 05, 2009 8:09 pm
Posts: 85
Location: k.c., mo.
getting ready to pull my 468 out of my 70 chevelle race car. was 12.3 to one 468 with old90 vintage afr ported brodix headsabout 320 cc if i remember. 272 278 cam on 112. 454r intake and 1050 annular 2 circuit carb. been running this same engine since 90 other than freshening. finally going to retire the ls6 short block. its got to break eventually. anyway i have a new callies drogon slayer 4.25 crank and the good callies rods with .070 je pistons. going to flow the heads and see where im at with them. i also need to get a cam picked out . thats where im at now. still need to make some decisions on a few things. the old motor ran a best of 9.69 @135


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 Post subject: Re: new 498
 Post Posted: Fri Nov 27, 2009 6:33 pm 
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Posts: 85
Location: k.c., mo.
my 1st question would be to ask what you think these heads might flow. i realize you dont have much info. 320 intake vol. 225 190 valves brodix catings ported in 90 by afr. any guesses.? im guessing they will go 360 on the intake. assuming that ,although i know thats only part of the eqation; how much performance would be gained by swithing to a similiar head from afr or bmf etc?


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 Post subject: Re: new 498
 Post Posted: Fri Nov 27, 2009 6:53 pm 
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Joined: Wed Apr 19, 2006 8:20 pm
Posts: 5852
Location: N.J.
Mike did a set of 320's for me and they flowed 380 at 700 so you should be close.
Although he told me there small for a 496....Here's a couple of pic's of them...
http://i126.photobucket.com/albums/p93/ ... ge0013.jpg

http://i126.photobucket.com/albums/p93/ ... ge0010.jpg

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 Post subject: Re: new 498
 Post Posted: Sat Nov 28, 2009 12:48 am 
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Joined: Mon Jan 05, 2009 8:09 pm
Posts: 85
Location: k.c., mo.
thanks for the pics. it looks like he did a nice job on them. i thought keeping the int volume on the conservative side would help with consistency with the throttle stop and bracket racing im doing


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 Post subject: Re: new 498
 Post Posted: Mon Dec 21, 2009 2:58 pm 
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Joined: Wed Jul 15, 2009 10:49 pm
Posts: 42
you need the heads tested for numbers . They probably are a good match for the 498 . im guessing upper 300s with the port job now .


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 Post subject: Re: new 498
 Post Posted: Mon Dec 28, 2009 10:44 pm 
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Joined: Mon Jan 05, 2009 8:09 pm
Posts: 85
Location: k.c., mo.
they are old but there's really not that many passes on them . ill find out the shape they are in this week. if they need a lot i will consider new ones


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 Post subject: Re: new 498
 Post Posted: Tue Dec 29, 2009 5:23 pm 
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Posts: 5852
Location: N.J.
gnicholson wrote:
they are old but there's really not that many passes on them . ill find out the shape they are in this week. if they need a lot i will consider new ones



I may be selling the whole top end that Mike did for me so before you go ahead and buy a set let me know if your interested...It will be
heads, intake, head bolts, crane gold rockers, push rods, and Morell lifters....

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 Post subject: Re: new 498
 Post Posted: Tue Jan 26, 2010 9:41 pm 
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Joined: Mon Jan 05, 2009 8:09 pm
Posts: 85
Location: k.c., mo.
--------------------------------------------------------------------------------

these heads were new in 1990. 320 cc on the intake 225 190 valves flowed @ 28 in of water on superflow 600. other than cleaning the ports and valves they are straight off the engine
cyl 1 int. ex cyl3 int. ex
.100 73 76 66 72
.150 109 105 105 99
.200 148 129 144 125
.250 187 152 185 149
.300 225 172 221 171
.350 260 192 257 191
.400 289 212 287 209
.450 312 231 308 227
.500 328 250 312 244
.550 342 265 325 260
.600 354 278 338 275
.650 365 288 349 286
.700 370 297 356 295
.750 372 303 362 304
notice how the ex outflows the intake at low lift and how the bad in. port falls off suddenly at .500. also the intake is basically done at 700 lift. the intake has a pretty std 3 angle valve job with some pretty sharp ridges from the top angle into the chamber on the int. radius seat on the ex. both valves are backcut 30 . what do you think? this is for a 498 in a 3200 lb bracket car

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 Post subject: Re: new 498
 Post Posted: Sat Jan 30, 2010 8:46 am 
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Joined: Sat Nov 03, 2007 4:44 pm
Posts: 1423
Location: Clawson, Mi.
You definetly got something going wrong in that #3 for sure #-o I would think they will be fine once you get all the ports more evenly flowing!!! :-k I run Dart Pro 1, 325 head's on my lil 505 and they flow like this with 2.250 int/1.88 exh only one port though!!! These heads only have gasket matching on them and some of the casting parting lines smoothed out inside the runners, and that's it, oh and PSI Triple springs(1.645 dia.) with Tit. retainers of course...

Corrected to 1.017
Superflow bench#?.....

Lift / Int / Exh.
---------------------
200 154.4 115.0
250 190.1 134.0
300 229.4 153.0
350 258.5 187.1
400 284.0 199.2
450 307.7 216.1
500 324.9 226.9
550 338.2 234.3
600 349.7 242.3
650 355.5 248.9
700 363.1 253.7
750 372.1 255.3
800 374.3 264.9

I buzz this engine to 8000 and it pulls hard upstairs, and the cam is only a .772,(-.795 with the 1.75 rocker arm)/.765 lift with a dur. @ .050 285/296, @ .020= .316/.329, 7/4 swap, seperat. 110 with 2 cut into it. I run Jesel shaft rockers with 1.75 int/ 1.70 exh. runs like an animal too =;





gnicholson wrote:
--------------------------------------------------------------------------------

these heads were new in 1990. 320 cc on the intake 225 190 valves flowed @ 28 in of water on superflow 600. other than cleaning the ports and valves they are straight off the engine
cyl 1 int. ex cyl3 int. ex
.100 73 76 66 72
.150 109 105 105 99
.200 148 129 144 125
.250 187 152 185 149
.300 225 172 221 171
.350 260 192 257 191
.400 289 212 287 209
.450 312 231 308 227
.500 328 250 312 244
.550 342 265 325 260
.600 354 278 338 275
.650 365 288 349 286
.700 370 297 356 295
.750 372 303 362 304
notice how the ex outflows the intake at low lift and how the bad in. port falls off suddenly at .500. also the intake is basically done at 700 lift. the intake has a pretty std 3 angle valve job with some pretty sharp ridges from the top angle into the chamber on the int. radius seat on the ex. both valves are backcut 30 . what do you think? this is for a 498 in a 3200 lb bracket car

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 Post subject: Re: new 498
 Post Posted: Wed Feb 24, 2010 9:02 pm 
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Joined: Mon Jan 05, 2009 8:09 pm
Posts: 85
Location: k.c., mo.
had a cam ground for this engine. heres what i decided on. tell me what you think. comp 4316 intake lobe 4273 exhaust. 110 lsa 279 286 @.050


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 Post subject: Re: new 498
 Post Posted: Sat Mar 27, 2010 8:33 pm 
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Joined: Mon Jan 05, 2009 8:09 pm
Posts: 85
Location: k.c., mo.
--------------------------------------------------------------------------------

http://i40.tinypic.com/205we4p.jpg http://i44.tinypic.com/2rhbcdg.jpg http://i44.tinypic.com/2s6looz.jpg http://i44.tinypic.com/23hnk8p.jpg http://i43.tinypic.com/fjom5i.jpg http://i43.tinypic.com/r7n0cz.jpg these are some pics of my cross member im in the process of redoing . i have a moroso kick out pan that i will now have 1.125 inches of clearance all the wat around. the brackets take the place of the side mounts and are travel limiters to keep the engine from flexing rearward. im using a steering box and front and rear engine plates .thought someone might like to see this


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