Built 5.3 issues
Thread Starter
On The Tree
Joined: Jul 2012
Posts: 111
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From: tulsa, ok
Built 5.3 issues Hi guys I have a 5.3 with flat tops ported and polished heads MLS heads gaskets head and main studs. Cam is .561/.578 222/225. 112lsa.
The intake valves went from 1.8" to 2.05"
Getting 34# injectors or 36# on the fence now. But with 34# Bosch red tops we can't get it tuned any suggestions? Cam surely isnt to big for 10.5 compression ratio. My ls1 has .621 lift and runs fine.
The intake valves went from 1.8" to 2.05"
Getting 34# injectors or 36# on the fence now. But with 34# Bosch red tops we can't get it tuned any suggestions? Cam surely isnt to big for 10.5 compression ratio. My ls1 has .621 lift and runs fine.
Run the numbers and make sure you have the correct bosh red tops. There were some being sold as the 34# injectors some years back, and turns out they were only in the lower to mid 20's off of some 4cyl car from the early 90's.
Not saying this is your issue, but worth a double check if you bought them used.
Also, may want to verify that you're using the correct impedance injectors.
Not saying this is your issue, but worth a double check if you bought them used.
Also, may want to verify that you're using the correct impedance injectors.
My go-to for affordable 40-ish lb injectors is 12613412 flex fuel truck injectors. Injector data is out there, they are cheap(I've bought whole new take-off sets for $50), and they worked fantastic on a cammed LS2 I ran for a year. Flex injectors actually flow a lot with gas because they have to be able to run E85 which is less power dense and requires more volume. Maybe the LS3s are cheap too. Weren't when I was in the market.
Last edited by Mercier; Mar 19, 2016 at 01:04 PM.
