Head choice for boosted LSX

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Dec 9, 2017 | 01:57 AM

geeman

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Head choice for boosted LSX

Have a 427 ,LSX block ,forged and studded bottom end,LS7 heads with studs,650 - 240 cam, Vortech YSI running 14 # on meth. 1200 hp intercooler. LS7 intake and ported throttle body with 85 # injectors and aeromotive 2000 pump.Has 9.4 compression. Attached to a 6 speed tranzilla. Dynoed at 740 rwhp.Want to turn it up but know the LS7 heads are the weak spot.Would love to hit at least 1000 rwhp. We run 94 fuel up here in Canada so I should be able to avoid detonation.What is the best head for this swap and is this all I need beside the pulley swap?

Last edited by geeman; Dec 9, 2017 at 02:33 PM.

Dec 9, 2017 | 08:35 AM

rotary1307cc

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Id put the mast 265 on

Dec 9, 2017 | 11:40 AM

sbcgenII

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From: Fort hood

What’s your pulley setup now? What compression is your motor? 740 seems low. Is it an automatic?

Dec 9, 2017 | 02:31 PM

geeman

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Quote:

Originally Posted by sbcgenII

What’s your pulley setup now? What compression is your motor? 740 seems low. Is it an automatic?

Its the A&A corvette setup with a inovators west balancer and a 3.3 in blower pulley.Compression is 9.4 with a 6 speed tranzilla

Dec 9, 2017 | 02:56 PM

geeman

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Quote:

Originally Posted by rotary1307cc

Id put the mast 265 on

I will look into those thanks

Dec 9, 2017 | 10:14 PM

1500HP

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We made 1170 before the rps twin started slipping, with 4 bolt heads never pushed any water on a LS7 then went to a 4L80 e made 875 rear wheel hp and went 8.81 and that was
8 years ago same kit Andy’s ysi Ron Shearer 1500 hp his big *** intercooler it was two 3 in
Garret cores welded together, I think no I know the ysi will run out of smoke before the stock heads are a problem

Dec 9, 2017 | 10:21 PM

1500HP

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Definitely need more injector

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Dec 11, 2017 | 11:38 AM

973800CamaroRS

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From: Thurmont MD

I'm super happy With my Frankenstein heads, not to mention a good price. Gonna need more injector for sure, Bosch 210s are hard to beat for the money.

Dec 11, 2017 | 02:08 PM

#10

hellbents-10

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TFS LS7 heads, or factory LS7s ported work great. My junk made 618rwhp NA with ported factory LS7 heads and a plastic intake.

Dec 12, 2017 | 10:32 PM

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geeman

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Quote:

Originally Posted by Realcanuk

You can make 1000 on the stock heads. As mention you are gong to probably need bigger injectors. Where in Canada are you ?

Live on Vancouver Island.Have to look into bigger injectors thanks.Just seems scary raising boost levels with 4 studs holding them down

Dec 14, 2017 | 08:32 PM

#12

1500HP

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Quote:

Originally Posted by geeman

Live on Vancouver Island.Have to look into bigger injectors thanks.Just seems scary raising boost levels with 4 studs holding them down

I was at 21 pounds on four bolt heads never pushed any water , yes 6 bolt is better but 4 bolt heads have made a lot of power just saying

Dec 15, 2017 | 06:55 AM

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Ratical

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There are guys running over 30psi with 317's not pushing water. There is a SBE low 8 second S10 on here that runs 31psi with no issues. It's all in the tune.