heads and cam lt1, 420rwhp??
heads and cam lt1, 420rwhp?? Hey guys, i gotta question for ya. A buddie of mine is building his lt1 and the guy he bought his heads from guaranteed him 420 rwhp. The car is a m6 with a stock 10 bolt w/ 3.73's. It will have all the bolt ons w/ long tube headers and the intake will be port matched w/ the heads. The heads are going to flow mid 270's on the intake and 190's on the exhaust side. The bottom end will be a bored over to make around 355 ci w/ forged pistons , stock rods and crank. I cant wait for him to get it out and i hope it runs great but i think the guy selling the heads told him a little much. What do you guys think. Those numbers seem high to you?
thats what i thought at first but when i told him he said rwhp. Oh the cam is the 306 cam or something like that, 585 lift i think. He will have roller rockers also.
sup im the guy that silverbeast is talking about....anyone know where to get a good custom grind cam to run with a set of heads flowing 278@.600 and full bolt ons(58mm tb, longtubes, 36lb injectors,etc)...i want to be right at or over 425 without juice
thanks
bubba
thanks
bubba
TECH Enthusiast
Joined: Mar 2004
Posts: 586
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From: Tinley Park
Originally Posted by groundpoundinlt1
sup im the guy that silverbeast is talking about....anyone know where to get a good custom grind cam to run with a set of heads flowing 278@.600 and full bolt ons(58mm tb, longtubes, 36lb injectors,etc)...i want to be right at or over 425 without juice
thanks
bubba
thanks
bubba
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Brett Foote TECH Enthusiast
Joined: Mar 2004
Posts: 586
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From: Tinley Park
Originally Posted by groundpoundinlt1
the heads i have flow better than the le3 heads lloyd offers!!!! my cam is just smaller so im thinking of going with a different cam.
Originally Posted by groundpoundinlt1
the heads i have flow better than the le3 heads lloyd offers!!!! my cam is just smaller so im thinking of going with a different cam.
I found some specs on a cam that would best fit my setup. Only Im using a Solid Roller. Bought it through thunder Racing for $260, Its a comp cam, although not a shelf cam that I know of. Even w/ my mods I dont expect to see much over 400 rwhp. You sure have some High expectations. Mods are on my cardomain page 4.
http://www.cardomain.com/memberpage/573287
Last edited by BRENTT94Z; Jan 20, 2005 at 02:50 PM.
The motor I built for my car was very similar. Heads flowed 276@.600 and 200@.600. The cam was a CC306 (230/244 54/576 112lls). Shortblock was a 355, stock crank, stock rods and TRW forged pistons. With hooker longtubes, mufflex 4" with a Spintech muffler and 10 bolt w/3.42's and 17x9.5" wheels I made 424rwhp and 401rwtq.
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Joined: Mar 2004
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From: Tinley Park
Not to hi-jack this thread, but what do you need to spin 6800 rpm w/ 350 ci displacement? To do it "safe" should i re-do the whole bottom end forged? Or will just forged pistons do? Pistons and crank?
There are no plans of spray or FI yet, so it is for a N/A car.
Thanks
There are no plans of spray or FI yet, so it is for a N/A car.
Thanks
Originally Posted by groundpoundinlt1
i went with cam motion...good support and quick email response...futural cams are made by cam motion and i saved a little dough with cam motion also
Teching In
Joined: Dec 2004
Posts: 20
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From: Mesa, AZ
400+rwhp is becoming more and more common from a full bolt on heads/cam lt1. Hell a guy over on cz28.com with ported AFR 210's and a Joe Overton cam hit 452rwhp on stock bottom end. When I do my heads/cam I will expect nothing less then 400rwhp through an auto and stock bottom end. I highly suggest you contact Joe Overton for a custom grind cam. PM me if you want a contact as I'm not sure I'm allowed to post it since he's not a sponsor.
Yeah 425 RWHP nowadays is not all that hard and doesnt' require a HUGE cam or heads that flow monster numbers.... it's all about the combo.... and the tune...
My previous setup was a 2 bolt 355 with SRP pistons, Eagle 6" rods, stock crank, and racenet LT1 Stage II heads that flowed 258cfm at .600 intake and 203 cfm at .600 exhaust. The cam was a 236/242 .556/.576 112lsa off the shelf comp cam extreme energy. Intake was ported with a 58mm throttle body, Hooker Lt's with a 4" mufflex exhaust. 30lb injectors and a piggyback DFI system that was tuned by Joe Overton.
Car put down 422RWHP and 397RWTQ..... And that was with a tune that Joe barely optimized since we were trying to tune out a backfire (I accidentally crossed #1 and #3 plugwire).....
Like i said it's all about a thought out combo and your car will KILL the dyno. My heads weren't all that but they fit well into the combo of parts.... My new combo is LT1 based with AFR 227's and i'd like to make 475RWHP with a TH400 and a 4000 stall converter (easily 500+ RWHP if I still had a T56 which those dyno #'s above were made with).....
My previous setup was a 2 bolt 355 with SRP pistons, Eagle 6" rods, stock crank, and racenet LT1 Stage II heads that flowed 258cfm at .600 intake and 203 cfm at .600 exhaust. The cam was a 236/242 .556/.576 112lsa off the shelf comp cam extreme energy. Intake was ported with a 58mm throttle body, Hooker Lt's with a 4" mufflex exhaust. 30lb injectors and a piggyback DFI system that was tuned by Joe Overton.
Car put down 422RWHP and 397RWTQ..... And that was with a tune that Joe barely optimized since we were trying to tune out a backfire (I accidentally crossed #1 and #3 plugwire).....
Like i said it's all about a thought out combo and your car will KILL the dyno. My heads weren't all that but they fit well into the combo of parts.... My new combo is LT1 based with AFR 227's and i'd like to make 475RWHP with a TH400 and a 4000 stall converter (easily 500+ RWHP if I still had a T56 which those dyno #'s above were made with).....