picked up a 70k mile LQ4 tonight .. going with a victor jr and a pro systems carb .. sugestions on cam and heads ..plz
For the $ your going to put into a victor jr and good carb, just keep it EFI and run a Edelbrock Pro-Flo XT LS Intake or FAST intake /w a 90mm TB and a conversion wiring harness.picked up a 70k mile LQ4 tonight .. going with a victor jr and a pro systems carb .. sugestions on cam and heads ..plz
what if i was to shave .030 off my 317 castings ? what would i get for comp? and would i have P,V clearence problems with .654/.609 lift cam ?
i decieded to go with texas speed's ported ls6 stg 2.5 heads and one of there cams .654/.609 235/240 dur , heads come with pushrods and the right valve springs , they claim 525-540 fwhp .If your looking to add compression and not spend the money on good cnc heads. Youd have to shave a TON off the heads to get the compression up (70cc on 317 head versus 64 cc on the following heads.
Sell your 317's ($200-$250)
Buy a set of stock 5.3l truck heads ($100) and shave those to 59cc OR
Buy a set of stock 243/799 LS6 castings shave to 62cc ($400) and will make 15 horsepower more than the 5.3l heads.
You could also go the L92 head route (about $500-$600 used for a set) , shave those .040 and go with a L92 port carb intake.
the guy i talked to at texasspeed said with the shorter duration cam ,piston to valve clearence will be fine .. and he said the head comb does come with pushrods .I dont think that cam will clear piston-to-valve with those heads without flycutting the pistons. Youll want to drop back to a lower lift intake lobe without flycutting. Heads do not include pushrods.
Weve never seen any horsepower difference from their 5.3l heads versus LS6 heads. I would recommend you save the money and get the 5.3l casting ones (alot cheaper too due to casting costs).
the guy i talked to at texasspeed said with the shorter duration cam ,piston to valve clearence will be fine .. and he said the head comb does come with pushrods .
"Weve never seen any horsepower difference from their 5.3l heads versus LS6"
do you have a shop that you do R&d on different heads and cam combo
Ive had a LS1 performance shop for about twice as long as Texas Speed has been in business....just be careful who you listen to on the phone. Their "phone guys" spend 8 hours a day on the phone with customers and in my opinion dont have the hands on experience to gaurantee anything. You probably spoke to "Matt or John". They usually have to put you on hold and ask one of the owners/managers when you ask detailed questions etc.
Dont take anyones "word" for it that there will be no piston to valve clearance. The cam you refer to is their "Tsunami" cam probably. with those heads and .650+ lift, I dont think it will clear piston/valve.
A complete heads/cam kit will probably come with pushrods. Just ordering heads will not. If you're basing your advice on what they say then I wont put my input in on what you need and good luck with your project
it plugs into both coil packs,crank sensor,cam sensor,ground it and run a 12 volt switch source....simple as that.i was going to build a 408w until i found this section I'm really thinking about it. can you do a step by step swap. i see your going carb thats the way i would do it, how do you run the ignition? do you still use the individual coils?