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5.3 heads on a 5.7???? and flywheel ????

This is a discussion on 5.3 heads on a 5.7???? and flywheel ???? within the Internal Engine forums, part of the LSx Technical Help Section category; I just picked up two LS1s and two LQ motors. None of them 100% complete, but enough parts between them ...

  1. #1
    Junior Member 69MyWay's Avatar
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    5.3 heads on a 5.7???? and flywheel ????

    I just picked up two LS1s and two LQ motors. None of them 100% complete, but enough parts between them to get my motor together for the C4 conversion.

    Question.

    1. I heard 5.3 heads work well on a 5.7. True/False?

    2. Will the 5.3 auto flexplate fit right on a 5.7 with no balance issues?

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    Senior Member mrr23's Avatar
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    1. the intake valve is smaller. so, the trade off will be higher compression, but less air getting in.

    2. yes.

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    Junior Member 69MyWay's Avatar
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    Very cool!

    I picked up a LS1 from a 98 Vette, a spare bare block, a 5.3 complete and a nearly complete 4.8 last weekend to piece together for my 85 Vette project.

    I'll slap that flywheel on. I'll see if my machine shop would be comfortable swaping valves, porting...etc. on the 5.3 heads.

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    Senior Member mrr23's Avatar
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    i see you are in central florida. we'll have to meet up one day.

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    Junior Member 69MyWay's Avatar
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    Quote Originally Posted by mrr23 View Post
    i see you are in central florida. we'll have to meet up one day.
    Sounds great. I am in Auburndale just off 540.

    My buddy has a C6 with headers, BB muffs, tune, t-stat, cold air...etc. He has been wanting to hook up with me and take the rides to the track. However, Lakeland closed the 1/8th mile...and I get so busy on the weekends trying to make the car run that it is hard to pair away to Bradenton.

    However...we need to make an exception soon and go get some time slips.

    Where do you run in Orlando?????

  6. #6
    Senior Member mrr23's Avatar
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    in orlando it's orlando speedworld. not the greatest for traction on test n tune nights. i prefer bradenton. been to gainesville once. didn't run.

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