Recently I've made the decesion to sel my car within the next year. Due to this I'm pulling the brakes on major mods such as the heads I planned on installing. These 5.3L heads were ported by forum member Mikey 97Z M6.

The heads would be great for a cammed car with bolt-ons, and they flow great. The exhaust numbers are awsome, so they'd be excellent for use with a power adder. The smaller chamber of the 5.3's will provide a nice compression boost of about 1/2 point. Here are the flow numbers after port work was complete. The heads come with a new set of Manley 2.0" intake valves and 1.6" exhaust valves. THIS is a link to a thread with pics he posted during the porting.

lift........./ int../ exh
.200...... 131.... 111
.250...... 160.... 131
.300...... 190.... 149
.350...... 217.... 168
.400...... 240.... 183
.450...... 257.... 201
.500...... 273.... 217
.550...... 283.... 228
.600...... 289.... 235
.650...... 295.... 241
.700...... 298.... xxx

-Fully ported 5.3's w/valve unassembled $480 shipped

- Patriot Gold Valvespring set. These are a low milleage set I picked up for the heads that only need valve keepers (keepers available from Patriot for $26). I Didn't really want to sell these, but if I sell the heads I have no need for them. If someone wanted the heads & valves I'd let these go with everything else for an additional $150.00. These springs have been pressure tested (seat/open) and are all good to go. I will only sell the springs WITH THE HEADS OR AFTER I'VE SOLD THE HEADS.

I'm just trying to get my money back and prices are very reasonable. I accept Pay Pal.

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Several people have asked. these heads have center bolt valve covers.

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whats the biggest cam you would reccomend with not having flycut pistons before having to worry about piston to valve issues?

 

are they stock 62cc chamber?

 

That's out of my realm of knowledge. I was told that cams in the mid 220s with 112 LSa or better SHOULD easily be OK. Beyond that it depends on cam timming. I'm running a stealth so I didn't really worry about it.

Chambers have had a little bit of work so I would guess with in a cc or so of stock.

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Are these still available? How large are the intake runners?