91ls1silverado

Just picked up these 241 heads from a buddy! I want to put some work into these heads before i put em on to make em at least worth the head swap, what can i do to the heads i was told port n polish, but where can i send them off to? And Martin@tickperformance told me i could mill my heads to bring up the compression, but what can i mill them to? Right now I have a rebuilt 98 LS1 with a sns stage 2 cam, ls1 intake, lt headers,ls7 lifters,7.400 pushrods and cold air intake. It is on a 91,C1500 with a 5 speed and 4.10s.

garygnu

they are a 66cc head ,maybe mill them down to 60cc.get a good valve job ,and have the springs installed correctly .advance induction ,and TEA do good porting .Texas Speed will port them also .maybe get a ls6 intake ,or a truck intake .the ls truck intake is better then a ls1 intake .

91ls1silverado

Alright cool man, thanks for the help! Id have to check them websites out!

Rise of the Phoenix

iTrader: (27)

Advanced Induction would be my choice for those heads. Checkout their high compression 241 head program. Several vey impressive dyno results with them floating around on here as well.

Zmg00camaross

iTrader: (11)

I always wanted to do there high compression 241 heads!! Be like yeah i run stock 241 heads of course most ppl doubt it already that I haven't touched them. But that's the fun part. Gm put them there in 2000.

mac62989

iTrader: (1)

http://www.advancedinduction.com/LSX...RGMLS1Head.php

91ls1silverado

Damn I'm impressed with AI work! Gonna have to save up and send them my heads soon! I can't wait!

Rise of the Phoenix

iTrader: (27)

AI did one hell of a job on the Dart/RHS heads I have. The CNC port work was amazing.

Rise of the Phoenix

iTrader: (27)

Here you go OP.

https://ls1tech.com/forums/dynamomet...o-results.html

https://ls1tech.com/forums/dynamomet...241-heads.html

https://ls1tech.com/forums/dynamomet...m-results.html

http://www.ls1gto.com/forums/showthread.php?t=436788

91ls1silverado

Thanks! I saw em all, I'm really interested in them and I'm going to need shorter pushrods right?

senicalj4579

iTrader: (41)

I would send those heads to TEA

https://ls1tech.com/forums/dynamomet...rwh-h-c-i.html

https://ls1tech.com/forums/11-second...new-setup.html

https://ls1tech.com/forums/10-second...-584-60-a.html

https://ls1tech.com/forums/generatio...-s-inside.html

Rise of the Phoenix

iTrader: (27)

Impossible to say until you measure.

91ls1silverado

Ahh okay thanks for the help!

ls1 down under

I had a set of 241's I was matching with a 0.575 lift cam , sent them off to a good cylinder head shop, i wanted them fully ported but as per the advice the shop gave me when i showed them my cam specs they done a 3 angle valve job, milled 0.30 and done some bowl blending. Nothing fancy , was not expensive but had fabulous results and suited the cam very well. Compression bump was very noticeable. They could of ported them right out and charged $$ but they didnt see the need with cam I was using.

JakeFusion

iTrader: (7)

I'd recommend the AI HCR 219s for the 241s. I have 241s laying around that I thought about doing the HCR treatment to and building a junkyard motor with them.

91ls1silverado

Thats what im gonna do man, but mine isnt a junkyard motor haha