I don't know about them,but you don't want to do any business with Naylor Racing engines in Dalzell SC. that have the big ad on here 565,582,600 cu in engines that make a 1000+hp for $10,500.Well I brought a 632 cu in engine from them on the invoice & were I paid the Bill its says 1100+ hp and I paid more for this than the 600 cu in engine to get more than 1,000+ hp,well this 632 cu in engine that cost more & I am sure makes more hp than the 600 cu in engines he offers would not make 950 hp I have the invoice & the the dyno sheets to prove this.After getting a notice from RJ to beware of another scammer on here I reported Naylor racing engines to them.I have not heard anything back from them yet.