hsr with top end kit cam an heads
12-05-2011, 09:10 PM
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Car: 1988 Gta trans am project 1-1/2
Engine: 86 4 bolt main cammed sbc 355 hsr
Transmission: 89 wc bw t5
Axle/Gears: Bw 9 bolt (3.27) pbr 11in
hsr with top end kit cam an heads
ok got a hsr setup ready to go on my gta 355 sbc i got the old 70's cast iron 194 smog heads off with the edelbrock rpm performer off as well the block has been drained off all antifreeze an been blow dryed for 30 minutes of so that the block is completely dry for the head gaskets to seal with ease the heads im putting on are 113 corvette aluminum heads no special port or anything like that just stock heads for you guys i need to know what a good cam will work with this setup i know the hsr could go to about 5300 rpm so that gives a wide selection of choices of cams that will help out with the rwhp an rwtq look to hit around 300hp an 330tq to the wheels for injectors i got accel 24 lbs using the stock tpi dizzy dont know what to use as a throttle body since i cant use the stock tpi throttle would hope to get all the help i need for this asap the 113 heads will be getting bolted on tomorrow
12-06-2011, 11:59 AM
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Car: 91 Camaro RS
Engine: empty bay (for now)
Transmission: Built T-56
Axle/Gears: 3.42 stock posi disc
Re: hsr with top end kit cam an heads
pretty sure you can use the stock TB on the hsr, but in not 100% on that.
12-06-2011, 12:30 PM
#3
Re: hsr with top end kit cam an heads
stock 113 heads? Anything done to the valve guide boss areas to gain more lift? Not sure but I thought those heads were limited to around .470-.480" lift, as are most factory heads?
If you can get them setup to handle more lift, I'd run a comp cc503 type grind... aka 276hr. Its around 224/230 .503/.510 on a 110 lsa. Heads wont take too much more cam without giving up alot of low end. Similar to LT1 heads, and they do well with 224 deg type cams. Shorter runner likes tighter lsa, but not as tight as LT1 intakes. 110-111lsa would be ok. 276HR can be ordered on a 110.
I assume you can tune this and dont need to pass emissions.
If you can get them setup to handle more lift, I'd run a comp cc503 type grind... aka 276hr. Its around 224/230 .503/.510 on a 110 lsa. Heads wont take too much more cam without giving up alot of low end. Similar to LT1 heads, and they do well with 224 deg type cams. Shorter runner likes tighter lsa, but not as tight as LT1 intakes. 110-111lsa would be ok. 276HR can be ordered on a 110.
I assume you can tune this and dont need to pass emissions.
12-06-2011, 04:52 PM
#5
Re: hsr with top end kit cam an heads
58cc...generally around 11 to 1 comp with a flat top 5cc relief piston. Lower 10's to 1 with a mild dish which most L98's came with. Plus stock engine has pistons in the hole about .025 , and they should be around -12cc dish for earlier year L98's, so with a .028" gasket you'd be comfortable at 9.8 to 1...actually abit too low for aluminum head motor.
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